Merge bitcoin/bitcoin#31464: util: Add missing types in make_secure_unique

fa39717 util: Add missing types in make_secure_unique (MarcoFalke)

Pull request description:

  The return type of `std::forward` depends on the template type, and can not be recovered from the args. Attempting to do so will result in a compile failure. For example, `make_secure_unique<std::string>(std::string{});` does not compile on current master, but does with this pull.

  Another example would be `make_secure_unique<std::pair<std::string, std::unique_ptr<int>>>(std::string{}, std::make_unique<int>(21));`

ACKs for top commit:
  hodlinator:
    ACK fa39717
  hebasto:
    ACK fa39717.
  TheCharlatan:
    ACK fa39717

Tree-SHA512: cc902c1111c929a79a6f806b5097136a465e8c727474176bad30a5777ebbb30bedb0bd35273b43bf839d2c00492500ddec724bd17349250451f6b329cb71e6f2

Author: fanquake

src/support/allocators/secure.h

@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2021 The Bitcoin Core developers
+// Copyright (c) 2009-present The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -74,7 +74,7 @@ secure_unique_ptr<T> make_secure_unique(Args&&... as)
 
     // initialize in place, and return as secure_unique_ptr
     try {
-        return secure_unique_ptr<T>(new (p) T(std::forward(as)...));
+        return secure_unique_ptr<T>(new (p) T(std::forward<Args>(as)...));
     } catch (...) {
         secure_allocator<T>().deallocate(p, 1);
         throw;